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Ohm's Law
 1) Which Law explains the following. At constant temperature the current flowing through a conductor is directly proportional to the potential difference between its ends. Ohm’s Law Charle’s Law Joule’s Law Boyle’s Law

 2) The current through a wire depends on? The resistance of the wire. The potential difference applied. Both resistance and potential difference. The thickness of the wire.

 3) Which of the following is an example for Ohmic resistor? Diode Nichrome Germanium Diamond

 4) What is reciprocal of resistivity called? Conductance Specific resistance Conductivity Capacitance

 5) Which of the following statement does not represent Ohm's Law? potential difference/resistance = current potential difference / current = resistance current = resistance x potential difference potential difference = current x resistance

 6) The work done in moving a unit positive charge across two points in an electric circuit is a measure of ___________. current potential difference resistance power

 7) The potential at a point is 20 V. The work done to bring a charge of 0.5 C from infinity to this point will be ________. 20 J 10 J 5 J 40 J

 8) The device used for measuring potential difference is known as _____________. potentiometer ammeter galvanometer voltmeter

 9) The unit of resistivity is ____________. Answer: 3 ohm ohm / m ohm-m mho

 10) The unit of current is _____________. ampere watt volt coulomb

 11) Two electric bulbs of 100 W, 200 V are put in series and the combination is supplied 100 V. The power consumption of each bulb will be 100 / 2 W 100 / 4 W 100 / 8 W 100 / 16 W

 12) Ohm's law is not applicable to DC circuits high currents small resistors semi-conductors

 13) Resistance of a wire is r ohms. The wire is stretched to double its length, then its resistance in ohms is (A) r / 2 (B) 4 r (C) 2 r (D) r / 4.

 14) Resistivity of a wire depends on length material cross section area none of the above.

 15) Ohm's law is a relationship between voltage, current, and time power, current, and resistance resistance, time, and current voltage, current, and resistance

 16) If current through a resistance is halved the resistance is halved the voltage is halved the voltage doubles none of the above

 17) Ohm's law describes the mathematical relationship between ohms, kilohms, and megohms resistor size and resistor value resistance, voltage, and current none of the above

 18) If voltage across a resistance doubles the current is halved the resistance doubles the current is unchanged none of the above

 19) If the resistance in a circuit with constant voltage increases, the current will increase decrease stay the same Not enough information

 20) If doubling the voltage across a resistor doubles the current through the resistor then the resistor value decreased the resistor value did not change the resistor value increased it is impossible to determine the change in t